WESTERN DIGITAL CORPORATION

WD1003A-RA2

  Data bus:                  16-bit, ISA

  Size:                      Full-length, full-height card

  Hard drive supported:      Two MFM ST506/412 drives

  Floppy drives supported:   Two 360KB, 720KB, 1.2MB, or 1.44MB drives

  Maximum heads/cyl.:        16 heads and 2048 cylinders

[Image]

                           CONNECTIONS

                  Function                        Location

  4-pin connector-drive active LED                   CN1

  20-pin data cable connector-drive 1                CN2

  20-pin data cable connector-drive 0                CN3

  34-pin control cable connector-hard drive          CN4

  34-pin data cable connector-floppy drive           CN5

                        USER CONFIGURABLE SETTINGS

                Function                    Location          Setting

  »   WD11C00C-22 in socket U16                JP1           pins 1 & 2
                                                               closed

      WD11C00-22 in socket U8 & JP5            JP1           pins 2 & 3
      pins 1 & 2 closed                                        closed

  »   Logical translation for drive 0          JP2              open
      disabled

      Logical translation for drive 0          JP2             closed
      enabled

  »   Logical translation for drive 1         JP2A              open
      disabled

      Logical translation for drive 1         JP2A             closed
      enabled

  »   Not used                                JP2B              open

  »   Factory configured - do not          JP3 & JP3A          closed
      alter

  »   Hard drive port address is               JP4           pins 2 & 3
      1F0-1F7h                                                 closed

      Hard drive port address is               JP4           pins 1 & 2
      170-177h                                                 closed

  »   Floppy drive port address is            JP4A           pins 2 & 3
      3F0-3F7h                                                 closed

      Floppy drive port address is            JP4A           pins 1 & 2
      370-377                                                  closed

  »   8 head hard drive or RWC                 JP5           pins 1 & 2
      (hard-wired)                                             closed

      16 head hard drive supported             JP5           pins 2 & 3
                                                                open

  »   Supports 300 or 360 RPM floppy           JP7           pins 2 & 3
      disk drives                                              closed

      Supports dual speed spindle              JP7           pins 1 & 2
      floppy drives                                            closed